Aluminum Call Advice Needed

[MS]

After 6 months of trial and error (and a lot of calls in the trash can), I have my copper, glass/crystal and slate calls sounding great with consistent rollover and rasp.  I made my first aluminum call this past weekend.  Shedua pot with blasted anodized aluminum over glass.  The call sounds flat, with absolutely no rollover and almost no rasp.  I need some advice on how an aluminum call is constructed differently than glass and slate calls.  More gap between soundboard to and surface bottom?  Larger or smaller pedestal?  Solid pedestal?  Segmented pedestal?  Other?  Please help save me from frustration!!   Many thanks for any advice or tips.

[mastevt]

I use a ring pedistal.  3/4 ID.   The pedistal itself is 3/16 wide.  My air gap is .085.  Distance from the top of the pedistal to the back wall is 5/16.  Make the gap around your soundboard to the sidewall as small and tight as possible, but dont let it touch  the side wall.  I use the black anodized material, and 5/16 acrylic peg for the striker.  It by far works best than any wood I have tried, even DW.  Purple Heart is second best.  If you cant find acrylic 5/16 rod, let me know, and I'll  send you a   couple to try.  It works very well on copper too.  The birds just hammered at my alum and copper this spring when I played them.  Use green scotch bright to condition the alum.

[outdoors]

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                                         acrylic peg